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They believe that anchoring something to the seabed, especially
at a depth of 4,000 meters, almost 2.5 miles, is difficult.
How does this sentence refine the ideas presented in the section
of the passage under the heading A Possible Solution?

A)It demonstrates a serious flaw in the proposed
solution.
B)It provides an alternative to the proposed solution.
C)It identifies a possible weakness in the proposed
solution
D)It emphasizes the strength of the proposed solution
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